OLN-WS-PC-800.pdf

a Division of

AECOM

Boston, Massachusetts, 02110

Prepared by: Prepared for:

Consultant PE Stamp

MASSACHUSETTS BAY TRANSPORTATION AUTHORITY

TUNNEL RATING

Rapid Transit Line :

Tunnel :

Tunnel Identification Number (TIN) :

Stations of Rating :

MBTA Contract Number :

MBTA Task Order Number :

Inspection End Date :

Rating Date :

Orange Line Northbound Washington Street Tunnel - South Section

OLN-WS-PC-800

271+55 (under Commuter Rail Tracks 5 & 7) 272+87 (under I-90 EB & WB)

Y92PS07

January 24, 2022 June 12, 2024

6/12/2024

Prepared by:

Consultant PE Stamp a Division of

Prepared for:

Boston, Massachusetts, 02110

MASSACHUSETTS BAY TRANSPORTATION AUTHORITY

TUNNEL RATING

Rapid Transit Line :

Tunnel :

Tunnel Identification Number (TIN) :

Stations of Rating :

MBTA Contract Number :

MBTA Task Order Number :

Inspection End Date :

Rating Date :

Orange Line Northbound Washington Street Tunnel - South Section

OLN-WS-PC-800

271+55 (under Commuter Rail Tracks 5 & 7) 272+87 (under I-90 EB & WB)

Y92PS07

January 24, 2022 June 12, 2024

6/12/2024

RECOMMENDATIONS

Based on the rating analysis results and corresponding tunnel inspection, the following recommendations are provided:

Safety Related Items:

• None at this time.

Emergency Structural Repair:

• None at this time.

Implement Monitoring Program of Severely Deteriorated Structural Members:

• None at this time.

Other Recommendations:

• The repair of all Action Items as recommended in the Routine All-Item Inspection Report dated

March 12, 2024.

• The continued regular inspection and maintenance of the structure to prevent deterioration of tunnel components.

MBTA Orange Line Boston, MA Washington Street Tunnel (South Section Northbound) OLN-WS-PC-800

TABLE OF CONTENTS

SUMMARY OF TUNNEL RATING

BREAKDOWN OF TUNNEL RATING

LOCATION MAP

TUNNEL LAYOUT LOCATION - ELEVATION

DESCRIPTION OF TUNNEL

COMPARISON OF PREVIOUS VS. CURRENT TUNNEL RATING ANALYSIS

ASSUMPTIONS AND CRITERIA

TUNNEL RATING ANALYSIS ASSUMPTIONS AND CRITERIA

TUNNEL RATING EVALUATION

RECOMMENDATIONS

AVAILABLE PLANS AND TUNNEL INSPECTION REPORTS

HIGHWAY / RAIL LOADINGS

APPENDIX A – MBTA ORANGE LINE ROUTINE ALL - ITEM TUNNEL INSPECTION REPORT

APPENDIX B – COMPUTATIONS

APPENDIX C – COMPUTER INPUT AND OUTPUT

APPENDIX D – PREVIOUS MBTA TUNNEL LOAD RATING REPORT

Boston, MA Washington Street Tunnel (South Section Northbound) OLN-WS-PC-800

BREAKDOWN OF TUNNEL RATING - ORANGE LINE TUNNEL STA 272+87 NB (CONT'D)

TOWN/CITY: Boston

CARRIES: I-90 OVER: Washington Street Tunnel (Orange

TUNNEL #: OLS-WS-PC-800 TIN: 800

TUNNEL COMPONENT

INVENTORY RATING BY

LOAD FACTOR METHOD

(ENGLISH TONS)

OPERATING RATING BY LOAD

FACTOR METHOD (ENGLISH

TONS)

H20 (20

Tons)

Type 3

(25

Tons)

Type 3S2

(36 Tons)

HS20

(36

Tons)

H20 (20

Tons)

Type 3

(25

Tons)

Type 3S2

(36 Tons)

HS20

(36

Tons)

FLEXURE RATING:

EXTERIOR WALL (LF)

AT 8.15FT

204.3 253.9 369.0 360.2 341.2 424.1 616.3 601.6

AXIAL RATING:

INTERIOR WALL

AT 0.00FT

929.9 1089.9 1691.1 1089.7 1552.9 1820.1 2824.2 1819.9

FLEXURE RATING:

EXTERIOR WALL (RT)

AT 8.15FT

216.0 268.9 391.8 386.0 360.7 449.1 654.3 644.6

FLEXURE RATING:

TOP SLAB (LF)

AT 8.55FT

115.5 161.6 254.6 207.7* 193.0 270.0 425.2 346.8*

FLEXURE RATING:

BOTTOM SLAB (LF)

AT 0.00FT

249.3 311.6 448.6 448.3 416.4 520.3 749.1 748.7

FLEXURE RATING:

TOP SLAB (RT)

AT 9.24FT

95.9 132.6 208.1 171.6a 160.2 221.5 347.6 286.6a

FLEXURE RATING:

BOTTOM SLAB (RT)

AT 18.48FT

247.1 308.8 444.6 444.4 412.6 515.6 742.4 742.1

* POI: TOP SLAB (LF) – AT 6.84FT

a POI: TOP SLAB (RF) – AT 11.09FT

Note: POI denotes Point of Interest.

MBTA Orange Line Boston, MA Washington Street Tunnel (South Section Northbound) OLN-WS-PC-800

AECOM 2

Line Northbound, South Portion)

BREAKDOWN OF TUNNEL RATING - ORANGE LINE TUNNEL STA 272+87 NB (CONT'D.)

INVENTORY RATING BY

LOAD FACTOR METHOD

(ENGLISH TONS)

OPERATING RATING BY LOAD

FACTOR METHOD (ENGLISH

TONS)

SU4 (27

Tons)

SU5 (31

Tons)

SU6

(34.75

Tons)

SU7

(38.75

Tons)

SU4 (27

Tons)

SU5 (31

Tons)

SU6

(34.75

Tons)

SU7

(38.75

Tons)

FLEXURE RATING:

EXTERIOR WALL (LF)

AT 8.15FT

268.5 310.2 349.3 390.9 448.4 518.0 583.4 652.8

AXIAL RATING:

INTERIOR WALL

AT 0.00FT

968.8 1025.2 1092.4 1177.1 1618.0 1712.2 1824.2 1965.7

FLEXURE RATING:

EXTERIOR WALL (RT)

AT 8.15FT

288.5 333.1 374.9 419.2 481.7 556.3 626.0 700.0

FLEXURE RATING:

TOP SLAB (LF)

AT 8.55FT

170.7 201.5 232.3 264.4 285.0 336.5 387.9 441.5

FLEXURE RATING:

BOTTOM SLAB (LF)

AT 0.00FT

336.4 386.2 432.8 482.5 561.8 644.9 722.8 805.8

FLEXURE RATING:

TOP SLAB (RT)

AT 9.24FT

137.7 160.4 184.9 210.5 230.0 267.9 308.8 351.5

FLEXURE RATING:

BOTTOM SLAB (RT)

333.4 382.7 429.0 478.3 556.8 639.1 716.4 798.7

Boston, MA Washington Street Tunnel (South Section Northbound) OLN-WS-PC-800

AECOM 3

CARRIES: I-90 OVER: Washington Street Tunnel (Orange

INVENTORY RATING BY

LOAD FACTOR METHOD

(ENGLISH TONS)

OPERATING RATING BY LOAD

FACTOR METHOD (ENGLISH TONS)

Tons)

TBusB

(36.24

Tons)

TBusC

(39.15

Tons)

EV2

(28.75

Tons)

EV3

(43

Tons)

TBusA

(21.82

Tons)

TBusB

(36.24

Tons)

TBusC

(39.15

Tons)

FLEXURE RATING:

EXTERIOR WALL (LF)

AT 8.15FT

121.8 202.5 217.6 484.9 645.3 203.5 338.1 363.4

AXIAL RATING:

INTERIOR WALL

AT 0.00FT

1080.1 1794.1 1938.0 1695.0 1630.3 1080.1 1794.1 1938.0

FLEXURE RATING:

EXTERIOR WALL (RT)

AT 8.15FT

127.6 212.0 228.0 515.5 692.0 213.1 354.1 380.8

FLEXURE RATING:

TOP SLAB (LF)

AT 8.55FT

124.7* 206.1* 219.6* 265.0 254.6 208.3* 344.2* 366.8*

FLEXURE RATING:

BOTTOM SLAB (LF)

AT 0.00FT

136.2 226.2 244.3 598.0 893.2 227.4 377.7 407.9

FLEXURE RATING:

TOP SLAB (RT)

AT 9.24FT

117.0 195.2 197.8 220.1 208.9 195.4 326.0 330.2

FLEXURE RATING:

BOTTOM SLAB (RT)

134.9 224.1 242.0 592.7 885.5 225.3 374.2 404.1

* POI: TOP SLAB (LF) – AT 6.84FT

a POI: TOP SLAB (RF) – AT 11.09FT

Note: POI denotes Point of Interest.

MBTA Orange Line Boston, MA Washington Street Tunnel (South Section Northbound) OLN-WS-PC-800

AECOM 4

CARRIES: I-90 OVER: Washington Street Tunnel (Orange

BREAKDOWN OF TUNNEL RATING - ORANGE LINE TUNNEL STA 272+87 NB (CONT'D)

(21.82

TBusA

* POI: INTERIOR WALL – AT 3.26 FT

a POI: Bottom Slab at 0.00 FT

Notes:

1. Shear rating will not govern for the interior wall per BrR rating results. Therefore, only show flexure rating factors.

2. Flexure rating will not govern for the exterior wall on the right per BrR rating results.

Therefore, only show shear rating factors.

3. Shear rating will not govern for the top and bottom slabs per BrR rating results. Therefore, only show flexure rating factors.

POI denotes Point of Interest.

NORMAL RATING BY LOAD FACTOR METHOD

(KIPS)

AREMA

Cooper

E-80

TUNNEL COMPONENT F40PH

(280K)

Modified

286K

Rail Car

(286K)

HSP-46

(296K)

CSX 315K

Rail Car

(315K)

ES44AC

(432K)

FLEXURE RATING: EXTERIOR

WALL (LF) – AT 8.16 FT

E-86.8 324.8 320.3 343.4 352.8 488.2

SHEAR RATING: EXTERIOR

WALL (LF) – AT 2.06 FT

E-87.2 303.5 309.7 320.3 341.7 467.9

FLEXURE RATING: INTERIOR

WALL – AT 0.00 FT*

E-293.5 2515.3 1512.7* 2815.4 1435.1 2620.0

SHEAR RATING: EXTERIOR

WALL (RT) – AT 2.06 FT

E-86.9 303.8 310.1 321.3 342.0 468.3

FLEXURE RATING: TOP

SLAB (LF)– AT 1.00 FT

E-103.2 400.3 389.7 423.0 424.0 590.2

FLEXURE RATING: BOTTOM

SLAB (LF) – AT 3.57 FT

E-125.1 445.7 451.4 471.8a 499.7 684.6

FLEXURE RATING: TOP

SLAB (RT)– AT 17.55 FT

E-102.0 397.1 386.4 419.3 420.3 585.2

FLEXURE RATING: BOTTOM

SLAB (RT) – AT 18.55 FT

E-127.1 445.5 454.8 471.1 501.1 687.1

MBTA Orange Line Boston, MA Washington Street Tunnel (South Section Northbound) OLN-WS-PC-800

AECOM 5

CARRIES: MBTA Commuter Rail Tracks 5 & 7 OVER: Washington Street Tunnel (Orange Line

Northbound, South Portion)

TUNNEL #: OLS-WS-PC-800 TIN: 800

BREAKDOWN OF TUNNEL RATING - ORANGE LINE TUNNEL STA 271+55 NB

4.

* POI: INTERIOR WALL – AT 4.9 FT

a POI.: BOTTOM SLAB – AT 0.00 FT

Notes:

1. Shear rating will not govern for the interior wall per BrR rating results. Therefore, only show flexure rating factors.

2. Flexure rating will not govern for the exterior wall on the right per BrR rating results.

Therefore, only show shear rating factors.

3. Shear rating will not govern for the top and bottom slabs per BrR rating results. Therefore, only show flexure rating factors.

POI Indicates Point of Interest.

MAXIMUM RATING BY LOAD FACTOR METHOD

(KIPS)

AREMA

Cooper

E-80

TUNNEL COMPONENT F40PH

(280K)

Modified

286K

Rail Car

(286K)

HSP-46

(296K)

CSX 315K

Rail Car

(315K)

ES44AC

(432K)

FLEXURE RATING: EXTERIOR

WALL (LF) – AT 8.16 FT

E-143.0 540.4 532.0 568.3 585.9 812.2

SHEAR RATING: EXTERIOR

WALL (LF) – AT 2.06 FT

E-143.2 500.6 510.0 529.3 563.3 771.8

FLEXURE RATING: INTERIOR

WALL – AT 0.00 FT*

E-487.6 4179.2 2516.7* 4677.9 2384.5 4353.1

SHEAR RATING: EXTERIOR

WALL (RT) – AT 2.06 FT

E-143.2 501.0 511.3 529.8 563.8 772.4

FLEXURE RATING: TOP

SLAB (LF)– AT 1.00 FT

E-171.5 665.2 647.6 702.8 704.5 980.6

FLEXURE RATING: BOTTOM

SLAB (LF) – AT 3.57 FT

E-207.8 740.5 750.0 783.9a 830.3 1137.5

FLEXURE RATING: TOP

SLAB (RT)– AT 17.55 FT

E-169.5 659.8 642.1 696.8 698.4 972.3

FLEXURE RATING: BOTTOM

SLAB (RT) – AT 18.55 FT

E-211.2 740.3 755.6 782.7 832.6 1141.7

MBTA Orange Line Boston, MA Washington Street Tunnel (South Section Northbound) OLN-WS-PC-800

AECOM 6

CARRIES: MBTA Commuter Rail Tracks 5 & 7 OVER: Washington Street Tunnel (Orange Line

Northbound, South Portion)

TUNNEL #: OLS-WS-PC-800 TIN: 800

BREAKDOWN OF TUNNEL RATING - ORANGE LINE TUNNEL STA 271+55 NB (CONT'D)

4.

LOCATION MAP

Boston, MA Washington Street Tunnel (South Section Northbound) OLN-WS-PC-800

AECOM 7

Boston, MA Washington Street Tunnel (South Section Northbound) OLN-WS-PC-800

LOCATION MAP - GENERAL

(ORANGE LINE DIAGRAM)

AECOM 8

Boston, MA Washington Street Tunnel (South Section Northbound) OLN-WS-PC-800

AECOM 9

I-90 over Orange Line Sta. 272+87

Commuter Rail Tracks 5 & 7 over Orange Line Sta. 271+55

TIN DRAWING AT RATING LOCATIONS

Boston, MA Washington Street Tunnel (South Section Northbound) OLN-WS-PC-800

AECOM 10

I-90 over Orange Line Sta. 272+87

Commuter Rail Tracks 5 & 7 over Orange Line Sta. 271+55

TUNNEL LAYOUT LOCATION - ELEVATION

NOTE: ORIGINAL PLANS USE DIFFERENT

BASELINE THAN AS LABELED IN FIELD

Boston, MA Washington Street Tunnel (South Section Northbound) OLN-WS-PC-800

AECOM 11

NOTE: THIS RATING IS FOR THE NORTHBOUND PORTION OF THE TUNNEL,

WHICH IS THE RIGHT BORE OF THE DIAGRAM ABOVE.

TUNNEL CROSS SECTION AT RATING LOCATIONS (SAME FOR BOTH CROSSINGS)

DESCRIPTION OF TUNNEL

Section 1: Tunnel Inventory Items

This section includes Identification and Age of Service Items – refer to the National Tunnel

Inventory and Element Data (NTIED) sheet of the most recent tunnel inspection report.

Identification Items

Age and Service Items

Section 2: Structure Details

Method of Construction: Cut and Cover Two cell rigid frame with internal concrete wall

Original Design Loading in Tunnel: Cooper E-72

Original Design Loading Over Tunnel: Unknown

Location of Ratings: Direction: OL Northbound track

TIN limits: Stations 263+87 to 293+63

Ratings calculated at Stations: 271+55 & 272+87

Coordinates: 42°20'51.2"N

71°04'02.9"W

Spans: 2 Continuous span concrete rigid frame at locations of ratings. Internal wall discontinues at multiple locations to be single cell box, but rating not required as fill is deep.

Tunnel Width: 41.62’ Out-to-Out

Track Surface: Direction fixation fasteners on concrete slab

Bore Width: Varies

Surface Structure: MBTA Tracks 5 & 7 / I-90 Massachusetts Tpke

Tunnel Structure: Double Cell Concrete Box at rating locations

Modifications to Original Structure: None

Fill: 5 ft fill depth under I-90 and MBTA

Commuter Rail Tracks 5 & 7, Granular and Misc Fill

Utilities: Electrical signal conduit within bottom slab

I.1 Tunnel Identification Number (TIN) OLN-WS-PC-800

I.2 Line Orange Line

I.3 Branch Main

I.11 Tunnel Name Washington Street Tunnel

(TIN limited to Northbound south portion of tunnel)

A.1 Year Built 1987

A.2 Year Rehabilitated N/A

A.3 Total Number of Tracks (in TIN) 1

A.6 Power Section(s) E-4

A.7 Service in Tunnel Heavy Rail

MBTA Orange Line Boston, MA Washington Street Tunnel (South Section Northbound) OLN-WS-PC-800

AECOM 12

N/A

95.9 Tons

There is no previous MBTA Tunnel Rating Report on file; therefore, a comparison of tunnel analysis and assumptions and criteria is not applicable to this tunnel rating report.

MBTA Orange Line Boston, MA Washington Street Tunnel (South Section Northbound) OLN-WS-PC-800

AECOM 13

COMPARISON OF PREVIOUS VS CURRENT TUNNEL RATING

ANALYSIS ASSUMPTIONS AND CRITERIA

H20 Controlling Operating

Rating N/A

160.2 Tons

Reinforcing Steel Yield

Stress N/A 40 ksi

Concrete Compressive Stress N/A 3000 psi

Controlling Element N/A Exterior Wall

Notable Discrepancies N/A

Year of Rating N/A 2024

Rating Consultant N/A AECOM

Rating Codes / References N/A

Rating Method N/A Load Factor

Rating Software N/A AASHTOWare BrR version 6.8.4

AREMA Cooper E-80

Controlling Normal Rating N/A E-86.8

AREMA Cooper E-80

Maximum Rating N/A E-143.0

H20 Controlling Inventory

Rating

1. MBTA Bridge Rating Report Format – 01-24-2020

2. MBTA Guidelines for Load Rating Transit Bridges, March 2004 (“MBTA”)

3. MBTA Commuter Rail Design Standards Manual, Volume I, Section III, Bridges, March 2009

4. AREMA 2018 Manual for Railway Engineering

5. AASHTO LRFD Bridge Design Specifications, 9th Edition, 2020

(“AASHTO”)

6. AASHTO Manual for Bridge Evaluation, 3rd Edition, 2018 with 2019 Interim Revisions (“MBE”)

7. AASHTO Standard Specifications for Highway Bridges, 17th Edition, 2002

(“SSHB”)

8. MassDOT LRFD Bridge Design manual, 2020 Edition (“MassDOT”)

9. AASHTOWare BrR version 6.8.4

TUNNEL RATING ANALYSIS ASSUMPTIONS AND CRITERIA

Rating References

This tunnel was rated in accordance with:

1. MBTA Bridge Rating Report Format – 01-24-2020

2. MBTA Guidelines for Load Rating Transit Bridges, March 2004 (“MBTA”)

3. MBTA Commuter Rail Design Standards Manual, Volume I, Section III, Bridges, March 2009

4. AREMA 2018 Manual for Railway Engineering

5. AASHTO LRFD Bridge Design Specifications, 9th Edition, 2020 (“AASHTO”)

6. AASHTO Manual for Bridge Evaluation, 3rd Edition, 2018 with 2019 Interim Revisions (“MBE”)

7. AASHTO Standard Specifications for Highway Bridges, 17th Edition, 2002 (“SSHB”)

8. MassDOT LRFD Bridge Design manual, 2020 Edition (“MassDOT”)

9. AASHTOWare BrR version 6.8.4

Tunnel OLN-WS-PC-800 carries I-90 over the MBTA Orange Line and the Commuter Rail over the

MBTA Orange Line in Boston, MA, between Back Bay Station and Tufts Medical Center Station. The tunnel consists of a rigid two-cell reinforced concrete frame with an internal wall. Dimensions are based on design and drawings.

A review of the MBTA tunnel plans and the Structures Inspection Field Report dated 03/01/2024 confirmed the tunnel structure is in good condition. No reduction in capacity was considered for this rating.

In accordance with the scope of work and the MassDOT Bridge Manual – Part I, Section 7.2.4.2B, this rating was performed using the Load Factor Method. Rating values have been calculated using the standard MassDOT load rating vehicles (H20, Type 3, Type 3S2, HS20, SU4, SU5, SU6 and SU7) and the MBTA TBusA, TBusB and TBusC vehicles at both the inventory and operating levels. Load ratings were calculated for the EV2 and EV3 trucks at the operating level only. Rating values were also calcu-lated using the standard AREMA Cooper E-80, F40PH-Modified Engine, 286K Rail Car, HSP-46 En-gine, CSX 315K Rail Car, and ES44AC for 315K CSX Rail Car loadings. Statutory levels are 80 kips per axle for the AREMA Cooper E-80, 280 kips for the MBTA F40PH-Modified Engine, 286 kips for the 286K Rail Car, 296 kips for the HSP-46 Engine and 315 kips for the CSX 315K Rail Car.

Rating Assumptions

The assumptions used in rating the tunnel components are based on information available on the tunnel plans and are as follows:

1. The following material properties were used in the analysis at STA 271+55 Commuter Rail Tracks 5 & 7 over Orange Line and STA 272+81 I-90 over Orange Line based on information provided in the tunnel inspection reports, MBTA Guidelines for Load Rating Transit Bridges and the AASHTO MBE:

MBTA Orange Line Boston, MA Washington Street Tunnel (South Section Northbound) OLN-WS-PC-800

AECOM 14

Reinforcing Steel: fy = 40,000 psi

Modulus of Elasticity of Steel: Es = 29,000 ksi

Unit Weight of Steel: ws = 490 pcf

Compression Strength of Concrete: f’c = 3000 psi

Unit Weight of Concrete: wc = 150 pcf

Unit Weight of Soil: ws = 120 pcf

2. The two-cell rigid frame tunnel structure was modeled using AASHTOWare BrR version 6.8.4. The tunnel was analyzed as a reinforced concrete box culvert; therefore, all structural components were evalu-ated.

Boston, MA Washington Street Tunnel (South Section Northbound) OLN-WS-PC-800

AECOM 15

TUNNEL RATING ANALYSIS ASSUMPTIONS AND CRITERIA (CONT'D)

3. MassDOT Part 1 section 7.2.4.3B specifies that the EV2 and EV3 trucks should be analyzed using BrR as a Permit Operating truck with a Type 3S2 truck placed in the adjacent lane. However, it was found that BrR does not support this method for analyzing box culverts. The EV2 and EV3 trucks were then conservatively applied as Design Loads and load ratings were reported at the operating level only.

7. The tunnel self weight, vertical earth pressure, lateral earth pressure and live load surcharge loads were all calculated by BrR. The live load surcharge equivalent depth was taken as 2 feet in accordance with the AASHTO SSHB section 3.20.3.

8. The corner haunches of the tunnel are included for dead load only. The bottom corner haunches are ignored, and the height of the culvert is conservatively taken as the maximum height between the top and bottom slab.

9. The tunnel has no fatigue sensitive details and the fatigue limit state was not evaluated.

4. Live load distribution was determined by BrR.

5. Live load impact was taken as 10% in accordance with AASHTO SSHB section 3.8.2.3.

6. Internal live loading from the Orange Line in the tunnel would apply only to the bottom slab of the tunnel and would produce opposite bending than the dead and earth loads. Therefore, only highway load-ing acting on top of the tunnel is considered in this analysis.

TUNNEL RATING EVALUATION

All trucks rate above statutory at both the inventory and operating levels. The load rating is controlled by

Flexure in the Top Slab atx=9.24ft for all trucks. See the table below for specific load ratings:

LIVE LOAD

INVENTORY

(ENGLISH TONS)

OPERATING

(ENGLISH TONS)

H20 (20 Tons) 95.9 160.2

Type 3 (25 Tons) 132.6 221.5

Type 3S2 (36 Tons) 208.1 347.6

HS20 (36 Tons) 171.6 286.6

SU4 (27 Tons) 137.7 230.0

SU5 (31 Tons) 160.4 267.9

SU6 (34.75 Tons) 184.9 308.8

SU7 (38.75 Tons) 210.5 351.5

EV2 (28.75 Tons) - 220.1

EV3 (43 Tons) - 208.9

TBusA (21.82 Tons) 117.0 195.4

TBusB (36.24 Tons) 195.2 326.0

TBusC (39.15 Tons) 197.8 330.2

Boston, MA Washington Street Tunnel (South Section Northbound) OLN-WS-PC-800

AECOM 16

All vehicles rate above statutory at both the normal and maximum levels. The load rating is controlled by shear in the left exterior wall for all vehicles except for the AREMA Cooper E-80 which is controlled by flexure in the top slab. See the table below for specific load ratings:

LIVE LOAD

NORMAL

(KIPS)

MAXIMUM

(KIPS)

AREMA Cooper E-80 E-86.8 E-143.0

F40PH (280K) Modified 303.5 500.6

286K Rail Car (286K) 309.7 510.0

HSP-46 Engine (296K) 320.3 529.3

CSX 315K Rail Car (315K) 341.7 563.3

ES44AC for 315K CSX Rail Car (432K) 467.9 771.8

Boston, MA Washington Street Tunnel (South Section Northbound) OLN-WS-PC-800

AECOM 17

TUNNEL RATING EVALUATION (CONT'D)

RECOMMENDATIONS

Based on the rating analysis results and corresponding tunnel inspection, the following recommendations are provided:

Safety Related Items:

• None at this time.

Emergency Structural Repair:

• None at this time.

Implement Monitoring Program of Severely Deteriorated Structural Members:

• None at this time.

Other Recommendations:

• The repair of all Action Items as recommended in the Routine All-Item Inspection Report dated

March 12, 2024.

• The continued regular inspection and maintenance of the structure to prevent deterioration of tunnel components.

Boston, MA Washington Street Tunnel (South Section Northbound) OLN-WS-PC-800

AECOM 18

AVAILABLE PLANS AND TUNNEL INSPECTION REPORTS

The following reports and plans were made available to AECOM for use during the bridge rating:

1. Parsons, Brinckerhoff, Quade, and Douglas Inc. Engineers

South Cove Tunnel Project

Dated: April 1977

2. MBTA Structures Inspection Field Report

Completed by: AECOM

Dated: March 2024

This report contains sheets showing the general plan, elevation, framing plan, and cross section.

Boston, MA Washington Street Tunnel (South Section Northbound) OLN-WS-PC-800

AECOM 19

LOADINGS

Boston, MA Washington Street Tunnel (South Section Northbound) OLN-WS-PC-800

AECOM 20

LOADINGS (CONT'D)

HL-93 Truck

HL-93 Tandem

MBTA Orange Line Boston, MA Washington Street Tunnel (South Section Northbound) OLN-WS-PC-800

AECOM 21

Included HL-93 and HL-93 Tandem ratings are LRFD.

NOTE: HL-93 Truck and HL-93 Tandem are for LRFR only and are included here for information only.

Boston, MA Washington Street Tunnel (South Section Northbound) OLN-WS-PC-800

AECOM 22

Boston, MA Washington Street Tunnel (South Section Northbound) OLN-WS-PC-800

AECOM 23

TBusA (40’ BUS)

TOTAL WEIGHT

21.82 TONS

TBusB (60’ BUS)

36.24 TONS

TBusC (60’ BUS)

38.65 TONS

Boston, MA Washington Street Tunnel (South Section Northbound) OLN-WS-PC-800

AECOM 25

Boston, MA Washington Street Tunnel (South Section Northbound) OLN-WS-PC-800

AECOM 26

Boston, MA Washington Street Tunnel (South Section Northbound) OLN-WS-PC-800

AECOM 27

APPENDIX A – MBTA ROUTINE ALL-ITEM TUNNEL INSPECTION REPORT

Boston, MA Washington Street Tunnel (South Section Northbound) OLN-WS-PC-800

Refer to the attached CD for the MBTA Orange Line Routine All-Item Tunnel Inspection Report.

01/24/22 11/23/22

Prepared by:

AECOM

Consultant PE Stamp

Stationing Start Stationing End

263+87 (Northbound) 293+63 (Northbound)

MBTA Contract No. Y92PS09 Task Order #1

Rail Transit Tunnel Inspection Routine All-Item Inspection Report

OLN WS PC 800

Report Date

Washington Street Tunnel

Orange Line

03/12/24

Rapid Transit Line

Tunnel Identification Number (TIN)

Tunnel

Inspection Start Date Inspection End Date a Division of

Prepared for:

Boston, Massachusetts, 02110

APPENDIX B – COMPUTATIONS

Boston, MA Washington Street Tunnel (South Section Northbound) OLN-WS-PC-800

STATEMENT OF CONCURRENCE ...............................................................................................B1

TUNNEL RATING REPORT CHECKLIST .................................................................................. B2

GENERAL PLAN, ELEVATION, AND SECTION .........................................................................B8

AECOM CALCULATION COVER PAGE AND CHECKLIST...................................................... B12

I-90 OVER MBTA ORANGE LINE BrR INPUT PARAMETERS......................................................B14

I-90 OVER MBTA ORANGE LINE HIGHWAY LOADINGS...........................................................B17

COMMUTER RAIL TRACKS 5 & 7 OVER MBTA ORANGE LINE BrR INPUT PARAMETERS.....................................................................................................................................B21

COMMUTER RAIL TRACKS 5 & 7 OVER MBTA ORANGE LINE RAIL LOADINGS..............B25

Boston, MA Washington Street Tunnel (South Section Northbound) OLN-WS-PC-800

RATING REPORT

CHECKLIST

CITY/TOWN: BOSTON

DISTRICT: 6

TUNNEL NAME: WASHINGTON STREET TUNNEL

FEATURE ABOVE: I-90/ COMMUTER RAIL

FEATURE BELOW: MBTA ORANGE LINE

BRIDGE IDENTIFICATION No.’s

TUNNEL NAME.: WASHINGTON STREET TUNNEL TIN: OLN-WS-PC-800

The Principal in Charge certifies that he/she has reviewed the Rating Report in accordance with this checklist and that all responses on this checklist are correct and accurately reflect the information presented on the submitted Rating Report.

SUBMITTED BY:

Signature of Principal in Charge Date

CHECKLIST INSTRUCTIONS

The purpose of this checklist is to help the rating engineer and reviewer ensure that MassDOT standards for Rating Reports have been followed and that all necessary information has been given. A NO (N) response for items so designated indicates a FATAL OMISSION that will result in an automatic rejection of the Rating Report. In all other instances, a NO (N) response or a NOT APPLICABLE (N/A) response may require a written explanation in the space provided. Numbers along the left-hand margin refer to the MassDOT Bridge Manual Part I Section 7.5.2.; some titles are added or modified, e.g. “Recommendations” has been added after the “2. Title Sheet”.

1. REPORT COVER

Y N N/A Does the rating report have “screws and studs” binding, clear plastic front and back covers, does the report cover sheet have a PE stamp with date signature and does it adhere to the format in accordance to Figure 7.1 in Part I of the Bridge Manual with the exception that a tunnel photo is included? (a NO (N) response indicates a FATAL OMISSION). The PDF DRAFT Submission and Re-Submission does not require binding/covers and the response should be N/A.

Explanation:

Y N Is the cover sheet of the correct busway/transit line/commuter rail color?

a) Blue for MBTA Blue Line

b) Green for MBTA Green Line

c) Orange for MBTA Orange Line

d) Red for MBTA Red Line or Harvard Square Busway Tunnel

e) Purple for MBTA Commuter Line

f) Silver for MBTA Silver Line Busway Tunnel

B-2

2. TITLE SHEET

Y N Is the title sheet a white copy of report cover sheet including the PE stamp and signature?

RECOMMENDATIONS

Y N Do the recommendations include speed restrictions, safety related items, emergency structural repair, or implementing a monitoring program for severely deteriorated structural members?

3. TABLE OF CONTENTS

Y N Is the title of each section outlined, with the page numbers correctly shown in the rating report?

4. SUMMARY OF TUNNEL RATING

Y N Are the rating values on the summary tunnel rating sheet correctly tabulated?

This would include the list of the controlling rating values from the Breakdown sheet. (a NO (N) response indicates a FATAL OMISSION).

Y N Is the format of the summary of tunnel rating sheet in accordance with Figure 7.2A or 7.2B in Part I of the Bridge Manual? Are the vehicle weights shown in parentheses after the listing of each type of vehicle, for example “H20 (20 Tons)” or “#3 Revenue Car (125 kips)”? (a NO (N) response indicates a FATAL

OMISSION).

Y N Is the “MBTA Bridge and Structures Engineer” shown? (a NO (N) response indicates a FATAL OMISSION).

5. BREAKDOWN OF TUNNEL RATING

Y N N/A Are the rating values on the breakdown sheet tabulated utilizing the listing of all tunnel elements that must be rated to determine the rating of the tunnel and at all critical locations as described in paragraph 7.2.2 of Part I of the Bridge Manual?

Explanation:

Y N Are the controlling rating values shaded with the appropriate color (green or yellow for rating factors over or under 1, respectively) and is text bold?

Y N Is the breakdown of the tunnel rating formatted in accordance with Figures 7.3A-1, 7.3A-2 and 7.3A-3, or 7.5B-1, 7.5B-2, and 7.5B-3, or 7.6A, or 7.6B, or

7.7 of Part I of the MassDOT Bridge Manual for all structures? Are the vehicle

B-3 weights shown in parentheses after the listing of each type of vehicle, for ex-ample “H20 (20 Tons)” or “#3 Revenue Car (125 kips)”? (a NO (N) response indicates a FATAL OMISSION).

6. LOCATION MAP

Y N Does the location map provide sufficient landmarks and adjacent highway information to allow the user to find the tunnel in the field without additional information?

Y N Is the location map in color?

7. DESCRIPTION OF TUNNEL

Y N Is the description of tunnel formatted in accordance with Figure 7.8 of Part I of the MassDOT Bridge Manual with the following exceptions: “Original Design Loading in Tunnel” replaces “Original Design Loading”; “Original Design Loading Over Tunnel” is added; “Tunnel Type” replaces “Bridge Type”;

“Feature(s) Above Tunnel” is added; "Tunnel Length" is added after "Spans";

"Tunnel Cover" is added; “Tunnel Width” replaces “Width of Bridge Deck”; “ Bore Width” is added after “Tunnel Width”; “Bridge Railing” and “Approach Railing” are removed; “Tunnel Structure” replaces “Superstructure”;

“Modifications to Original Tunnel Structure” replaces “Modifications to Original Superstructure”; “Substructure” and “Modifications to Original Substructure” are removed? For railroad tunnels, is the “Roadway Width” removed and the “Roadway Surface” replaced with “Track Surface”? Does the description match the inspection report?

8. TUNNEL RATING ANALYSIS ASSUMPTION AND CRITERIA

Y N Are all the methods, assumptions, allowable stresses, ultimate strengths, live load distribution and computer programs used to determine the rating of the structure clearly described?

Y N N/A Has the condition of the tunnel structural elements been reviewed and evaluated? Has a statement been included indicating the specific tunnel structural elements that have not been rated?

Explanation:

Y N N/A Is additional discussion included for any condition or situations that are extraordinary for this particular structure?

Explanation: See “Rating Analysis Assumptions and Criteria”.

9. EVALUATION OF TUNNEL RATING AND RECOMMENDATIONS

Y N N/A Are the guidelines for recommendations in accordance with Subsection 7.2.11 of Part I of the Bridge Manual? If there is an increase in the rating values, if there a brief explanation comparing the changes to the previous rating values?

Explanation:

B-4

10. AVAILABLE PLANS AND TUNNEL INSPECTION REPORTS

Y N N/A Is the title of this section “AVAILABLE PLANS AND TUNNEL INSPECTION

REPORTS”? (a NO (N) response indicated a FATAL OMISSION).

Explanation:

Y N N/A Are all plans, tunnel inspection reports, and their respective sources that were available for the rating stated?

Explanation:

12. APPENDIX A: 4D MBTA TUNNEL INSPECTION REPORTS

Y N Is this the latest available Inspection Report with a signed cover? (a NO (N) response indicates a FATAL OMISSION).

Y N Are all of the photos of the inspection report in color? (a NO (N) response indicates a FATAL OMISSION).

Y N Do the following National Tunnel Element Inspection (NTEI) and National Tunnel Inventory Element Data (NTIED) pages appear after the inspections with a cover sheet like in the Inspection Report Submittal: NTEI(s);

Previous/Original NTIED; Marked up NTIED; the new NTIED?

Explanation:

13. APPENDIX B: COMPUTATIONS

Y N Does the computation table of contents include the correct page numbers?

Y N N/A Commuter Rail: Are standard diagrams used?

AREMA Cooper E-80, F40PH (280K) Modified, 286K Rail Car, HSP-46 Engine, CSX 315K Rail Car and ES44AC for 315K CSX Rail Car.

Y N N/A Transit: Are standard diagrams used?

Revenue Car Load: None Work Car Combinations: None

Y N N/A Pedestrians: Original Design Load or 90 psf? Emergency Vehicle H-10? Snow

Removal Vehicle?

Highway: Are standard diagrams used?

Trucks: HL-93, HL-93 Tandem, H20, Type 3, Type 3S2, HS20, SU4 to SU7, EV2, EV3 and Snow Removal Vehicles where applicable.

MBTA Buses: TBusA (21.82 Tons), TBusB (36.24 Tons) and TBusC (38.65 Tons)

11. LOADINGS USED FOR TUNNEL RATING

B-5

Y N Is the written agreement of the independent reviewer (Statement of Concurrence) in accordance with Subsection 7.4.3 included? Is it signed and dated? (a NO (N) response indicates a FATAL OMISSION).

Y N Is this Checklist included after the Statement of Concurrence? (a NO (N) response indicates a FATAL OMISSION).

Y N Do all calculation header sheets include a company logo, calculated by, checked by, and dated?

Y N N/A Does the load input summary account for all the loads and distribution factors?

Explanation: Loads and Distribution Factors calculated by BrR Y N N/A

Are the non-composite dead loads clearly shown? Do they include sketches and references if applicable?

Explanation: Calculated by BrR

Y N N/A Are the superimposed dead loads clearly shown? Do they include sketches and references if applicable?

Explanation: Calculated by BrR

Y N N/A Is the live load distribution factor calculated in accordance with Section 7.2.4 of

Part I of the Bridge Manual and/or AASHTO, and/or Guidelines for Load Rating Transit Bridges, and/or Commuter Rail Design Standards Manual?

Explanation: Calculated by BrR

Y N N/A For loss of capacity to a section of the tunnel, are As-Inspected ratings performed? For example, if there are corroded steel girder/ stringer webs, are the webs crippling and buckling calculations included in accordance with section 7.2.9 in Part I of the Bridge Manual?

Explanation: No loss of capacity

14. APPENDIX C: COMPUTER INPUT AND OUTPUT

Y N N/A Are all input, output, summary pages, including software generated sketches of the model included in the rating report?

15. APPENDIX D: PREVIOUS MBTA TUNNEL LOAD RATING REPORT

Y N N/A Are Sections 2, and 4 to 11 as identified above (or the best fit for these sections), for the previous report included in the hard copy of the report (the previous rating report PDF shall be included in its entirety in the electronic flash drive submission)? If there is no previous report, provide an explanation on Appendix D cover page.

Explanation: This is the first load rating report

B-6

DRAFT SUBMISSION

Is one (1) PDF copy Draft of the Rating Report being submitted?

Explanation: Final and Electronic Submission

RE-SUBMISSION

Y N N/A Have the comments from the MBTA on the Draft submission been addressed?

Explanation: Final and Electronic Submission

Y N N/A Is one (1) PDF copy of the revised Rating Report being submitted?

Explanation: Final and Electronic Submission

Please note: The Summary of the Tunnel Rating sheet from the DRAFT or RE- SUBMISSION will be printed, signed, dated, and scanned by the MBTA. The scanned Summary of Tunnel Rating PDF will be sent to the rating engineers. In the Hard Copy and the PDF of the Tunnel Rating Report, the rating engineers will replace the DRAFT or RE_SUBMISSION Summary of Tunnel Rating with scanned Summary of Tunnel Rating.

FINAL SUBMISSION

Y N N/A Is one hard copy of the Rating Report (three hole punched and bound with posts and screws) being submitted?

Explanation: _________________________

Y N N/A Is one (1) CD/DVD/thumb drive being submitted in accordance with section

7.3.1 in Part I of the Bridge Manual which contains the following: All analysis software files (AASHTOWare Bridge Rating is preferred) for rating a particular tunnel in accordance with section 7.4.2 in Part I of the Bridge Manual; and Adobe Acrobat (PDF) format file of the report in accordance with sections 7.5.1 and 7.5.2 in Part I of the Bridge Manual (with exceptions described in the checklist); all previous rating report(s); and all available plans in accordance with section 7.5.3 in Part I of the Bridge Manual? (a NO (N) response indicated a FATAL OMISSION).

Previous Tunnel Rating Report(S) Not Found. If there are no previous rating reports, provide a page stating “Previous MBTA Tunnel Rating Report(S)

– NONE Retrieved.”

Referenced Drawings Not Found. If no drawings are found, provide a page stating “Existing MBTA Referenced Drawings – NONE Retrieved.”

Explanation:

B-7

GENERAL PLAN, ELEVATION & SECTIONS

B-8

GENERAL PLAN, ELEVATION &

SECTIONS (CONTINUED)

B-9

B-10

B-11

Q4NA-331-FM4

CALCULATION COVER PAGE

BASIC INFORMATION

Project MBTA Tunnel Rating

Job No.

60666692

TTP No. (if req’d) N/A

Total pages includes attachments

Page 1 of

Client Department/Discipline Calculation No.

MBTA Structural OLN-WS-PC-800.01

Subject / Title OLN-WS-PC-800.01 - BrR Input

Calculation Rev. No. Originator Discipline Reviewer Technical Peer

Reviewer (if req’d) Confirmation Req’d

Y/N 0 Wenjing Yang Matt Sprague N/A N

Calculation Objective:

To model the concrete tunnel in AASHTO BrR using culvert definitions.

To load the bridge with dead and highway loads specified in Scope of Work.

Calculation Methodology and data to be confirmed:

LFD rating method.

Tunnel dimensions and properties are based on available plans and measurements from tunnel inspection.

References / Inputs/ Field Data:

MBTA Guidelines for Load Rating Transit Bridges, March 2004 MassDOT LRFD Bridge Manual, Chapter 7, Revision January 2021.

AASHTO LRFD Bridge Design Specifications 9th Edition, 2020 AASHTO Standard Specifications for Highway Bridges, 2002 AASHTO Manual for Bridge Evaluation, 3rd Edition, 2018 with 2019 Interims Available Plans Available Inspection Report

Conclusions including confirmations to be obtained:

The tunnel has been accurately modeled to represent the existing tunnel conditions. The tunnel loads and highway loads are appropriately applied. The model produces reasonable results under all loading conditions.

This calculation is complete and ready for Discipline Review:

Originator Signature / Date

B-12

2/7/2022

CALCULATION REVIEW CHECKLIST

PROJECT NO.

CLIENT DISCIPLINE

CALCULATION NO. REV. NO.

SUBJECT/TITLE

ORIGINATOR REVIEWER

LEAD INDEPENDENT CALCULATION

PREPARER (if used)

Review Yes No N/A

Explain “No” responses:

Reviewer in lieu of eview

Independent Calculation Preparer

4. Have calculations prepared using technical software or excel spreadsheets (with macros or equations) been confirmed through a secondary method (i.e, manual, alternate software)?

Q3 -351-FM2, Revision , 201

AECOM

MBTA Tunnel Rating 60666692

MBTA Structural 800.01

OLN-WS-PC-800.01 - BrR Input

Wenjing Yang Matt Sprague

Christopher Cucco x x x x x x x

Digitally signed by Sprague, Matthew DN: cn=Sprague, Matthew, ou=USBOS1, email=matthew.sprague@aecom.com Date: 2024.06.12 09:51:56 -04'00'

Sprague, Matthew

B-13

JOB TITLE MBTA OLN-WS-PC-800 LOAD RATING

CALCULATION NO. OLN-WS-PC-800.01

ORIGINATOR Wenjing Yang Date 2/7/2022 REVIEWER Matt Sprague Date 2/7/2022

AASHTO BrR Input Parameters

Described below are all relevant input parameters for the modeling and analysis of TIN OLN- WS-PC-800. Output parameters are discussed in calculation OLN-WS-PC-800.02. All the following categories are to be checked on screen/paper as required.

1. Materials

a. Concrete:

i. f’c = 3000 psi per MassDOT Bridge Manual 7.2.5.11 and AREMA Chap. 8, Part 19, Section 19.4.1.1.

ii.normal weight of reinforced concrete: w.c=0.15 kcf

b. Reinforcing Steel:

i.fy = 40 ksi per MBE 6B.5.3.2 and AREMA Table 8-19-2

c. Soil:

i.Unit Weight: γs = 0.120 kcf from AASHTO BrR Library - standard soil 1

2. Geometry

a. Tunnel Dimensions:

b. Skew angle: assume 59.84 degree conservatively per structure alignment plan.

3. Rating Approach/Assumptions:

a. Corner haunch are included for dead load but not for stiffness in the structural analysis. Bottom corner haunch are ignored, and conservatively using the maximum vertical clearance between the two cells. Therefore, any other mechanical (including dynamic equipment loads) and architectural systems supported by the tunnel can be

800- I90 OVER ORANGE LINE SECTION

(STA 272+87)

I-90 OVER ORANGE LINE (STA 272+87)

BrR INPUT PARAMETERS

B-14 ignored in the dead load.

b. Internal live loading on the box tunnel is only applicable to the bottom slab (traffic is driving directly on the bottom slab). Application of this live load will put the slab into opposite flexure as the dead load and soil load reaction forces. Therefore, worst case scenario does not include internal tunnel live load acting down on the bottom slab.

c. There are no signs of distress or deterioration; therefore, the box tunnel is considered to be in satisfactory physical condition.

d. Load Factor Design (LFD) method to be used for this tunnel rating.

e. A 5 ft fill depth is assumed based on the profile on Plan CE-4.

f. Wearing surface was assumed to have the same unit weight as the soil. Therefore, the weight is included with the soil vertical loads, consequently the vertical earth pressure load factors are applied for the wearing surface.

4. LFD Load Factor

a. 2002 AASHTO Std. Specifications from AASHTO BrR Library

5. Load Calculations

a. Dead Load Component, DC:

i.Tunnel self-weight computed by AASHTO BrR.

b. Vertical Earth Loads, EV:

i.Weight of the soil acting on the top of the tunnel computed by AASHTO BrR.

c. Horizontal Earth Loads, EH i.Lateral earth pressure on the walls of the tunnel computed by AASHTO BrR.

d. Surcharge Loads, LS

i. Live Load Surcharge on the walls of the tunnel computed by AASHTO BrR.

h.eq=2 ft per standard specs 3.20.3.

e. Live Load, LL i.H20, Type 3, Type 3S2, HS20, SU4, SU5, SU6. SU7, EV2 and EV3, TBusA, TBusB, and TBusC.

ii.Per MassDOT LRFD Bridge Manual Chapter 7.2.4.3B, Type EV2 and Type

EV3 were defined as Permit Load Rating and the Type 3S2 was defined as the Adjacent Vehicle. Under the Advanced Vehicle Properties, the Adjacent vehicle live load factor was set as 1.3.

f. Impact/ Dynamic Load Allowance i.IM= 10% per standard specs section 3.8.2.3.

6. Reinforcement Details (per Plan SE 19 & SE 36)

I-90 OVER ORANGE LINE (STA 272+87)

BrR INPUT PARAMETERS (CONTINUED)

B-15

I-90 OVER ORANGE LINE (STA 272+87)

BrR INPUT PARAMETERS (CONTINUED)

B-16

HIGHWAY LOADINGS

H20 Unit Weight = 40 kips (20 tons).

HS20

Unit Weight = 72 kips (36 tons).

Type 3 (MBE Figure D6A-1) Unit Weight = 50 kips (25 tons).

Type 3S2 (MBE Figure D6A-2) Unit Weight = 72 kips (36 tons).

I-90 OVER ORANGE LINE (STA 272+87)

HIGHWAY LOADINGS (CONTINUED)

B-17

Single-Unit SHV’s that Meet Federal Bridge Formula B (MBE Figure D6A-7)

FAST Act Emergency Vehicles (Note: EV vehicles are analyzed with a live load factor of 1.3.)

I-90 OVER ORANGE LINE (STA 272+87)

B-18

B-19

B-20

JOB TITLE MBTA OLS-WS-PC-800 LOAD RATING

CALCULATION NO. OLS-WS-PC-800.01

ORIGINATOR Wenjing Yang Date 1/18/2022 REVIEWER Christopher Cucco Date 1/18/2022

AASHTO BrR Input Parameters

Described below are all relevant input parameters for the modeling and analysis of TIN OLS- WS-PC-800. Output parameters are discussed in calculation OLS-WS-PC-800.02. All the following categories are to be checked on screen/paper as required.

1. Materials

a. Concrete:

i. f’c = 3000 psi per MassDOT Bridge Manual 7.2.5.11 and AREMA Chap. 8, Part 19, Section 19.4.1.1.

ii.normal weight of reinforced concrete: w.c=0.15 kcf

b. Reinforcing Steel:

i. fy = 60 ksi from AASHTO BrR Library

c. Soil: (modified from standard soil 1 per AREMA standard practice) i.Unit Weight: γs = 0.120 kcf ii.Maximum lateral soil pressure (LFD) = 1.0 x 120 psf = 120 psf iii.Minimum lateral soil pressure (LFD) = 0.33 x 120 psf = 40psf

2. Geometry

a. Tunnel Dimensions:

b. Skew angle: assume 71.25 degree conservatively per structure alignment plan.

3. Rating Approach/Assumptions:

a. Bottom corner haunches are ignored, and conservatively using the maximum vertical clearance between the two cells. Therefore, any other mechanical (including dynamic equipment loads) and architectural systems supported by the tunnel can be ignored in the dead load.

b. Internal live loading on the box tunnel is only applicable to the bottom slab (traffic is driving directly on the bottom slab). Application of this live load will put the slab into opposite flexure as the dead load and soil load reaction forces. Therefore, worst case scenario does not include internal tunnel live load acting down on the bottom slab.

c. There are no signs of distress or deterioration; therefore, the box tunnel is considered to be in satisfactory physical condition. (Need to confirm once we have inspection)

B-21

Commuter rail over Orange Line (sta 271+55) BrR Input

d. There are no post/pre-tensioning forces; therefore, MBE Article 6A.2.2.2 does not apply.

e. Load Factor Design (LFD) method to be used for this tunnel rating.

f. Distance between commuter rail tracks was taken equal to 12 ft.

g. A 5 ft fill depth is assumed based on the profile on Plan CE-4.

h. Override BrR LFD live load distribution factor to 1.35 based on 5 ft fill depth. See below LLDF calculation for details.

4. Live Load Distribution Factor

LFD live load distribution - BrR LFD live load distribution - AREMA Adjusted LLDF: M=(Ld-6)/hf=(12.75-6)/5=1.35

5. LFD Load Factor Define LFD factors in BrR as below per AREMA 19.5.3.2. Use it to override the LFD load factors used in AASHTO BrR.

For flexure Φ= 0.90 For shear Φ = 0.85

= M*hf

B-22

Commuter rail over Orange Line

BrR Input (CONT'D)

6. Load Calculations

a. Dead Load Component, DC:

i.Tunnel self-weight computed by AASHTO BrR.

b. Vertical Earth Loads, EV:

i.Weight of the soil acting on the top of the tunnel computed by AASHTO BrR.

Assume fill depth, H = 5 ft per profile plan.

c. Horizontal Earth Loads, EH i.Lateral earth pressure on the walls of the tunnel computed by AASHTO BrR.

d. Surcharge Loads, LS

i. Live Load Surcharge on the walls of the tunnel computed by AASHTO BrR.

Equivalent height of soil for live load surcharge:

h.eq= (Max Axle Load)/(Axle spacing*γs*Ld)= 80000/(5*120*12.75) =10.46 ft (conservatively use the maximum axle load of the AREMA Cooper E-80)

Lateral Live Load Distribution Width per AREMA Figure 8-16-2:

Ld=2*(8.5/2+5/2)+12=25.5 ft for 2 tracks or Ld= 25.5/2=12.75 ft per axle.

e. Live Load, LL i.Commuter Rail Loads per Scope of Work:

AREMA Cooper E-80 F40PH (280K) Modified HSP-46 (296K) Locomotive 286K Rail Car 315K CSX Rail Car

ES44AC for315K CSX Rail Car NOTE: When defining commuter rail loads in BrR, manually apply the impact factor shown below to vehicle axle loads to calculate live load effects for a unit strip.

f. Impact, I i.I = 225/sqrt(L) = 225/ sqrt(17.86) = 53.24% at 18 inches to 0% at 10 ft

Use I=53.24%-53.24%/(10-1.5)*(5-1.5)=31.32% in AAHSTO BrR to define vehicles.

B-23

Commuter rail over Orange Line

7. Reinforcement Details (per Plan SE 19 & SE 36)

B-24

Commuter rail over Orange Line

B-25

RAIL LOADINGS

modified axle load:

71.5*1.313=93.88 modified axle load:

74*1.313=97.16 modified axle load:

78.75*1.313=103.40 modified axle load:

70*1.313=91.91 modified axle load:

40*1.313=52.52 80*1.313=105.04 52*1.313=68.28

Commuter rail over Orange Line

Live loading

B-26 modified axle load:

72*1.313=94.54

Commuter rail over Orange Line

Live loading (cont'd)

APPENDIX C – COMPUTER INPUT AND OUTPUT

Boston, MA Washington Street Tunnel (South Section Northbound) OLN-WS-PC-800

TYPICAL CULVERT SECTION ........................................................................................................ C1

LFD RATING OUTPUT I - 90 OVER ORANGE LINE..................................................................... C2

LFD RATING OUTPUT COMMUTER RAIL TRACK 5&7 OVER ORANGE LINE........................C21

Boston, MA Washington Street Tunnel (South Section Northbound) OLN-WS-PC-800

R22R23

R24 R25

B21B23

B25

R21

B22

D21 D21D22 D22

W21 W21

R21

B22

W22 W22

I90 over MBTA Orange Line - DOUBLE CELL BOX SECTION -

OLN-WS-PC-800

C-1

AASHTO Culvert LFR Engine - Version: 6.8.4.3002

2/7/2022 3:38:07 PM

Analysis Preference Setting: None

UserInput:

Box Number: OLN-WS-PC-800 Identification: I-90 over Orange Line

STA 272+87

Number of cells: 2 Variable Cell Widths Width[1]: 17.100 (ft) Width[2]: 18.480 (ft) Cell Height: 16.290 (ft) Depth of Fill at Start: 5.000 (ft) Depth of Fill at End: 5.000 (ft) Live Load Distribution Factor: 1.750 Run Type: LFR Design Vehicle Option: Envelope Skew Angle: 59.8 Box Length: 150.00 (ft) Surcharge Height: 2.000 (ft) Water Height: 0.00 (ft) Top Slab Thickness: 33.0 (Inches) Bottom Slab Thickness: 39.0 (Inches) Exterior Wall Thickness: 30.0 (Inches) Interior Wall Thickness: 12.5 (Inches) Pinned Top Slab: False Subgrade Modulus: 0.0 Haunches:

TopExterior:

Width x Depth: 12.0 x 12.0 (Inches) TopInterior:

Width x Depth: 12.0 x 12.0 (Inches) BottomExterior:

Width x Depth: 0.0 x 0.0 (Inches) BottomInterior:

Width x Depth: 0.0 x 0.0 (Inches)

Reinforcement R21 #8@12.0" Epoxy: False Corner(Upper Left) Horz Leg: 7.330', Vert Leg: 13.620', Wall Num: 3 Cover Wall: 2.0", Cover Slab: 2.0", B22 #9@12.0" Epoxy: False Corner(Lower Left) Horz Leg: 7.330', Vert Leg: 10.750', Wall Num: 3 Cover Wall: 2.0", Cover Slab: 3.0", R21 #8@12.0" Epoxy: False Corner(Upper Right) Horz Leg: 7.330', Vert Leg: 13.620', Wall Num: 1 Cover Wall: 2.0", Cover Slab: 2.0", B22 #9@12.0" Epoxy: False Corner(Lower Right) Horz Leg: 7.330', Vert Leg: 10.750', Wall Num: 1 Cover Wall: 2.0", Cover Slab: 3.0", R24 #9@12.0" Epoxy: False Positive Top Slab Length: 20.080', Start: 10.040' Ref Pnt: CL_Cell, Cell/Wall Num: 1 Cover: 1.5"

C-2

I-90 over Orange Line

R25 #9@12.0" Epoxy: False Positive Top Slab Length: 21.460', Start: 10.730' Ref Pnt: CL_Cell, Cell/Wall Num: 2 Cover: 1.5" B21 #10@12.0" Epoxy: False Positive Bottom Slab Length: 21.790', Start: 10.895' Ref Pnt: CL_Cell, Cell/Wall Num: 2 Cover: 1.0" B23 #10@12.0" Epoxy: False Positive Bottom Slab Length: 20.410', Start: 10.205' Ref Pnt: CL_Cell, Cell/Wall Num: 1 Cover: 1.0" R22 #9@12.0" Epoxy: False Negative Top Slab Length: 30.450', Start: 14.540' Ref Pnt: CL_InteriorWall, Cell/Wall Num: 2 Cover: 2.0" R23 #9@12.0" Epoxy: False Negative Top Slab Length: 14.000', Start: 7.000' Ref Pnt: CL_InteriorWall, Cell/Wall Num: 2 Cover: 2.0" B25 #9@12.0" Epoxy: False Negative Bottom Slab Length: 30.450', Start: 14.540' Ref Pnt: CL_InteriorWall, Cell/Wall Num: 2 Cover: 3.0" W21 #8@12.0" Epoxy: False Wall Length: 17.000', Start: 0.000' Ref Pnt: HorzConstJoint, Cell/Wall Num: 1 Cover: 1.5" W21 #8@12.0" Epoxy: False Wall Length: 17.000', Start: 0.000' Ref Pnt: HorzConstJoint, Cell/Wall Num: 3 Cover: 1.5" W22 #5@12.0" Epoxy: False Wall Length: 17.000', Start: 0.000' Ref Pnt: HorzConstJoint, Cell/Wall Num: 2 Cover: 1.0" W22 #5@12.0" Epoxy: False Wall Length: 17.000', Start: 0.000' Ref Pnt: HorzConstJoint, Cell/Wall Num: 2 Cover: 1.0" D21 #8@12.0" Epoxy: False Dowel Length: 2.920', Start: 1.250' Ref Pnt: HorzConstJoint, Cell/Wall Num: 1 Cover: 2.0" D21 #8@12.0" Epoxy: False Dowel Length: 2.920', Start: 1.250' Ref Pnt: HorzConstJoint, Cell/Wall Num: 3 Cover: 2.0" D22 #5@12.0" Epoxy: False Dowel Length: 1.830', Start: 0.750' Ref Pnt: HorzConstJoint, Cell/Wall Num: 2 Cover: 1.0" D22 #5@12.0" Epoxy: False Dowel Length: 1.830', Start: 0.750' Ref Pnt: HorzConstJoint, Cell/Wall Num: 2 Cover: 1.0"

EV Loads Unit weight of backfill: 0.120 kcf Outside width of box culvert: 41.620 ft Depth of Backfill at Start: 5.000 ft

C-3

Depth of Backfill at End: 5.000 ft Installation Method: Embankment Side fill condition: Compacted Fe at Start, soil-structure interaction: 1.0240 Fe at End, soil-structure interaction: 1.0240 w(e) at Start, Earth Pressure(per Unit Width): 0.6144 ksf w(e) at End, Earth Pressure(per Unit Width): 0.6144 ksf We at Start, Total Earth Load(per Unit Width): 25.5720 kip/ft We at End, Total Earth Load(per Unit Width): 25.5720 kip/ft

DW Loads Wearing Surface Thickness: 0.0 in Wearing Surface Load: 0.0 psf

EH Loads Lateral Earth Pressure (max): 0.060 kcf Lateral Earth Pressure (min): 0.030 kcf Depth of Backfill at Start: 5.000 ft Depth of Backfill at End: 5.000 ft Total Box Culvert Height: 16.290 ft Top Slab Thickness: 2.750 ft Bottom Slab Thickness: 3.250 ft

Surcharge Loads Coefficient of Lateral Earth Pressure: 0.500 Unit Weight of Backfill: 0.120 kcf Height of Surcharge: 2.000 ft

Specification Checking

*** Article 8.16.2.7 Computation for Constants

*** Article 8.16.4 Passed for Ext. Wall 1

*** Article APPG.6.1 Passed for Ext. Wall 1

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